We compared the effectiveness of postural reduction and instrumental reduction in the treatment of thoracolumbar and lumbar vertebra fracture in 40 patients. Under general anaesthesia, postural reduction in a stretching prone position was first performed. Instrumental reduction and fixation were then conducted. Radiographs were made after each reduction. Comparisons between the two films and the fracture films were made based on the changes in prevertebral height of both the fractured vertebra and the adjacent superior and inferior intervertebral spaces. It was found that the recovery of the prevertebral height in postural and instrumental reductions was basically identical. The recovery of the prevertebral height in the intervertebral spaces was more significant in instrumental reduction. Both reductions were ineffective in patients whose compression of the diseased vertebra was more than two-thirds of the normal. In cases of lower lumbar vertebra fractures, the effect of both reductions was unsatisfactory. Our findings indicated that the effectiveness of the reduction of vertebra fracture depends on the quantitative change of the spongy bone of the injured vertebra. Instrumental reduction only exerts an indirect tension. Postural reduction is effective in reducing thoracolumbar vertebral fracture, while instrumental reduction exerts only a relatively weak effect but it is particularly useful to maintain the result of postural reduction.

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